Gaming system for playing common game in groups and control method thereof

1. A gaming system, comprising: a plurality of gaming machines; and a control device connected to the gaming machines, wherein: each of the gaming machines has: a display device, which displays a plurality of symbols; a respective controller configured to execute instructions to rearrange symbols arranged on the display device after gaming mediums are betted, and thereafter, execute a base game in which a payment is made in accordance with the rearranged symbols; and a respective communication interface, which transmits information pertinent to the betted gaming mediums to the control device, together with information for identifying a transmission source, and wherein: the control device has: a memory, which stores identification information for identifying a gaming machine associated with a common game executed simultaneously in groups and identification information for identifying a group to which the gaming machine belongs; a control device communication interface, which receives information transmitted from each of the gaming machines; and a control device controller configured to execute instructions to: specify a group to which a transmission source of information received by the control device communication interface belongs, based upon the information stored in the memory; accumulatively sum up a reserved amount in the specified group, and then, storing the sum in the memory in order to reserve part of the gaming mediums betted at the gaming machine as the transmission source in groups to which the gaming machines belong; and execute part of a computation required to execute the common game; determine a timing of transferring the base game to the common game in groups; start the common game at a gaming machine belonging to one group, in a case where the timing is established in said one group; and postpone commencement of the common game in another group in a case where the timing is established in said another group while the common game is executed in said one group.

2. The gaming machine according to claim 1 , comprising, in groups, common display devices connected to respective ones of the gaming machines belonging to the groups, wherein one of the common display devices provided in the groups has the control device.

3. A control method of performing a common game in groups comprising a plurality of gaming machines, each gaming machine having a respective processor, said method comprising the steps of: at each of the gaming machines, via the respective processor, rearranging symbols arranged on the display devices after gaming mediums are betted, and thereafter, executing a base game in which a payment is made in accordance with the rearranged symbols; and via the respective processor, transmitting information pertinent to betted gaming mediums and information for identifying a transmission source to a control device connected via a communication interface, the control device having a control processor; and at the control device, via the control processor, specifying a group to which a transmission source of received information belongs; via the control processor, accumulatively summing up a reserved amount in the specified group, and then, storing the sum in the memory in order to reserve part of the gaming mediums betted at the gaming machine as the transmission source in groups to which the gaming machines belong; via the control processor, determining a timing of transferring the base game to the common game in groups; via the control processor, starting the common game at a gaming machine belonging to one group, in a case where the timing is established in said one group; and via the control processor, postponing commencement of the common game in another group in a case where the timing is established in said another group while the common game is executed in said one group.